The lengths of the links comply wi th the condi t ion: A͞B=A͞D=A͞D. Link 2 is designed with two perpendicular slots and rotates about fixed axis C. Link 2 can be rotated by a single slider. The second slider enables the mechanism to pass through the extreme position (dead point). The mechanism has a transmission ratio between links 1 and 2 equal to i₁₂=ω₁/ω₂=2 where ω₁ and ω₂ are the angular velocities of links 1 and 2.
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